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Kelia and her husband, artist Joe Termini, consider Justin and Hailey their close friends.

'We're really close with them, we're like regular friends,' she says of the kinship between the famous foursome.

She said of her friendship with Hailey: 'We haven't known each other for many years but it feels as if we have. She's kind of like my sister in a way - she's always there.' Kelia Moniz is pictured with Hailey Baldwin (right) in a recent social media snap

Kelia and her husband, artist Joe Termini, consider Justin and Hailey their close friends: 'We're really close with them, we're like regular friends,' she says. Kelia Moniz is pictured with Hailey Baldwin (left) in a recent social media snap

The surfer, who hails from Oahu, Hawaii, has two world championship titles, and is known for her longboarding skills.

Meanwhile, her artist husband Joe has worked on his 'Cash Only' art project with 25-year-old pop star Justin.

The As long As You Love Me singer and his on-off love Hailey were married last year.

Skillful! The surfer, who hails from Oahu, Hawaii, has two world championship titles

Champion: The 26-year-old athlete is known for her longboarding skills

Justin is now reportedly seeking treatment for depression, and though he is allegedly struggling personally, his wife is not the source of his problems.

'It has nothing to do with Hailey - he is very happy being married to her. It's just something else that he struggles with mentally,' a source recently told People.

'He has good help around him and is receiving some treatment. He seems confident he will feel better soon.'

Newlyweds: Justin Bieber (left) and his on-off love Hailey Baldwin were married last year